BTW, I FOUND the ordiance for lake Cassidy - 12.08.020 and to me it confirms my thought that it is legel to have a motor bigger than 10 HP on the lake, so long as it is not used to "propel" the boat (bold is my addition):
12.08.020 Motorboats permitted -- restricted speed and power.
Due to the potential interference with other water uses and danger of impact and wake damage on smaller lakes, the maximum speed of any motorboat on the following lakes and on any lake listed in SCC 12.08.030 is restricted to eight miles per hour and the maximum power used to propel any motorboat on any such lake is restricted to 10 certified OBC horsepower:Name
31 30 06
30 28 05
23 31 04
07 28 06
23 27 04
(Ord. 82-099 § 1, adopted September 24, 1982; Res. adopted December 12, 1977; Res. adopted June 30, 1975; Ord. 94-026 § 2, March 30, 1994).
12.08.030 Motorboats -- Internal combustion motors prohibited.
Due to the inadequate flow or other factors where pollution from motor discharge is aggravated by internal combustion motor discharge, or the pristine character of upland lakes over 1,500 feet in elevation in danger of being seriously damaged, or the small size (under 45 acres), or shallow depth, or a configuration rendering the of internal combustion motor-powered watercraft hazardous, the propulsion of a motorboat in whole or in part by an internal combustion motor is unlawful upon the following lakes:
"I like to turn it up to 11, it's one louder than 10".